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Autonomous hybrid IV

Post questions and info about hybrid (compressed gas with fuel) powered cannons here. This includes discussion about fuels, ratios, ignition systems, build types, safety, and anything else relevant.
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Re: Autonomous hybrid IV

Unread postAuthor: hectmarr » Wed Apr 17, 2019 10:23 am

jrrdw wrote:If you have to re-size or adapt brake cylinder pistons I will suggest a very, very sharp clean file. You have made a great choice for durability, these things last for ever. I've rebuilt a boat load of brake cylinders in my mechanical career and the piston cylinder wears out before the piston 99% of the time in my own experiences.

I will take your advice into account if it is necessary to reduce the diameter of the brake piston a few tenths of a millimeter. I just found one of 32 mm, which should fit very fair. I think I'll have to reduce to 31, 7 mm.
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Re: Autonomous hybrid IV

Unread postAuthor: jrrdw » Thu Apr 18, 2019 6:48 am

If you have enough wall thickness on the cylinder you might want to take the material from there thus trueing the cylinder making them a matched pair. It really does improve performance and reliability.
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Re: Autonomous hybrid IV

Unread postAuthor: hectmarr » Thu Apr 18, 2019 12:11 pm

I found these pistons that adapt without any modification to the inside of the steel tube that I have. The one with the red arrow is the one who serves me. I have to check with a Toyota agency about this piston. I hope to get it. I'll have to play with trying some o`rings to fit perfectly.
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